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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 3184 | * request's cookies, if available. |
| 3185 | * |
| 3186 | * Returning a value of false will effectively short-circuit setting |
| 3187 | * the current user. |
| 3188 | * |
| 3189 | * @since 3.9.0 |
| 3190 | * |
| 3191 | * @param int|false $user_id User ID if one has been determined, false otherwise. |
| 3192 | */ |
| 3193 | $user_id = apply_filters( 'determine_current_user', false ); |
| 3194 | if ( ! $user_id ) { |
| 3195 | wp_set_current_user( 0 ); |
| 3196 | return $current_user; |
| 3197 | } |
| 3198 | |
| 3199 | wp_set_current_user( $user_id ); |
| 3200 | |
| 3201 | return $current_user; |
| 3202 | } |